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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "src/v8.h"
      6 
      7 #include "src/api.h"
      8 #include "src/assembler.h"
      9 #include "src/base/once.h"
     10 #include "src/base/platform/platform.h"
     11 #include "src/bootstrapper.h"
     12 #include "src/crankshaft/lithium-allocator.h"
     13 #include "src/debug/debug.h"
     14 #include "src/deoptimizer.h"
     15 #include "src/elements.h"
     16 #include "src/frames.h"
     17 #include "src/isolate.h"
     18 #include "src/libsampler/sampler.h"
     19 #include "src/objects-inl.h"
     20 #include "src/profiler/heap-profiler.h"
     21 #include "src/runtime-profiler.h"
     22 #include "src/snapshot/natives.h"
     23 #include "src/snapshot/snapshot.h"
     24 #include "src/tracing/tracing-category-observer.h"
     25 
     26 namespace v8 {
     27 namespace internal {
     28 
     29 V8_DECLARE_ONCE(init_once);
     30 
     31 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
     32 V8_DECLARE_ONCE(init_natives_once);
     33 V8_DECLARE_ONCE(init_snapshot_once);
     34 #endif
     35 
     36 v8::Platform* V8::platform_ = NULL;
     37 
     38 
     39 bool V8::Initialize() {
     40   InitializeOncePerProcess();
     41   return true;
     42 }
     43 
     44 
     45 void V8::TearDown() {
     46   Bootstrapper::TearDownExtensions();
     47   ElementsAccessor::TearDown();
     48   LOperand::TearDownCaches();
     49   RegisteredExtension::UnregisterAll();
     50   Isolate::GlobalTearDown();
     51   sampler::Sampler::TearDown();
     52   FlagList::ResetAllFlags();  // Frees memory held by string arguments.
     53 }
     54 
     55 
     56 void V8::InitializeOncePerProcessImpl() {
     57   FlagList::EnforceFlagImplications();
     58 
     59   if (FLAG_predictable && FLAG_random_seed == 0) {
     60     // Avoid random seeds in predictable mode.
     61     FLAG_random_seed = 12347;
     62   }
     63 
     64   if (FLAG_stress_compaction) {
     65     FLAG_force_marking_deque_overflows = true;
     66     FLAG_gc_global = true;
     67     FLAG_max_semi_space_size = 1;
     68   }
     69 
     70   if (FLAG_opt && FLAG_turbo && strcmp(FLAG_turbo_filter, "~~") == 0) {
     71     const char* filter_flag = "--turbo-filter=*";
     72     FlagList::SetFlagsFromString(filter_flag, StrLength(filter_flag));
     73   }
     74 
     75   base::OS::Initialize(FLAG_random_seed, FLAG_hard_abort, FLAG_gc_fake_mmap);
     76 
     77   Isolate::InitializeOncePerProcess();
     78 
     79   sampler::Sampler::SetUp();
     80   CpuFeatures::Probe(false);
     81   ElementsAccessor::InitializeOncePerProcess();
     82   LOperand::SetUpCaches();
     83   SetUpJSCallerSavedCodeData();
     84   ExternalReference::SetUp();
     85   Bootstrapper::InitializeOncePerProcess();
     86 }
     87 
     88 
     89 void V8::InitializeOncePerProcess() {
     90   base::CallOnce(&init_once, &InitializeOncePerProcessImpl);
     91 }
     92 
     93 
     94 void V8::InitializePlatform(v8::Platform* platform) {
     95   CHECK(!platform_);
     96   CHECK(platform);
     97   platform_ = platform;
     98   v8::tracing::TracingCategoryObserver::SetUp();
     99 }
    100 
    101 
    102 void V8::ShutdownPlatform() {
    103   CHECK(platform_);
    104   v8::tracing::TracingCategoryObserver::TearDown();
    105   platform_ = NULL;
    106 }
    107 
    108 
    109 v8::Platform* V8::GetCurrentPlatform() {
    110   DCHECK(platform_);
    111   return platform_;
    112 }
    113 
    114 
    115 void V8::SetPlatformForTesting(v8::Platform* platform) { platform_ = platform; }
    116 
    117 
    118 void V8::SetNativesBlob(StartupData* natives_blob) {
    119 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
    120   base::CallOnce(&init_natives_once, &SetNativesFromFile, natives_blob);
    121 #else
    122   CHECK(false);
    123 #endif
    124 }
    125 
    126 
    127 void V8::SetSnapshotBlob(StartupData* snapshot_blob) {
    128 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
    129   base::CallOnce(&init_snapshot_once, &SetSnapshotFromFile, snapshot_blob);
    130 #else
    131   CHECK(false);
    132 #endif
    133 }
    134 }  // namespace internal
    135 }  // namespace v8
    136